Listen to the sound of a Ham station calling CQ using (a) morse code or (b) voice.
"Calling CQ" means the operator wants to talk with any other (Ham) station which
will reply to his/her call, ie. he/she is not calling one particular station.

The morse code example is a Scottish Ham operating from Antigua in the Caribbean, so his
callsign was V2/GM0GAV (GM0GAV is his call from his home station in Scotland ;
V2 (the prefix for Antigua) with the "/" indicates he is operating portable in Antigua.

The voice example is a station operating from an island in French St. Martin. His
call was FS5PL "portable" (he operated portable within the same country as the callsign
was issued for). When a station identifies (gives his/her callsign) in voice, the callsign is
usually given phonetically, using the ICAO alphabet (internationally understood).
For example, "alpha" means the letter "A", "bravo" means "B", etc..

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NOTES:
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recorder buttons to appear).